There's nothing quite like a bit of refreshing ceviche on a sunny, warm day to help cool things down a bit. This shrimp and scallop version takes on the simple flavors of lemon and lime, dressed up with mango, jicama, and jalapeño for a bit of heat.
In a large bowl or container, combine the first 6 ingredients. Gently press the shrimp and scallop down so that they are covered in the juices. Cover with a lid and place in the refrigerator to marinate for 12-24 hours.
Then, place the next 6 ingredients in a stainless steel mixing bowl. Drain the excess juice from the shrimp and scallop mixture using a fine-meshed sieve and add the mixture to the bowl. Mix well using a rubber spatula.
Lastly, add the remaining ingredients and mix gently to avoid breaking down the avocado. Serve immediately with tortilla chips.